Malicious PDF — malware analysis report

Static analysis result for SHA-256 cefdd67de790580c…

MALICIOUS

PDF

84.2 KB Created: 2021-09-17 05:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 8ead82120091bdae661b1a6a08889f38 SHA-1: 0691a095f4c6e2a9acb42eacb742f81851eef8f9 SHA-256: cefdd67de790580c7b734facf481ec355027a7fbdd640ab732cbe70124e594f6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier returned a high probability of maliciousness. It contains numerous embedded URLs pointing to PDFs hosted on disposable domains, suggesting a link farm designed to obscure the ultimate destination. The PDF itself appears to be a lure, as indicated by the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://finadev-groupe.com/userfiles/file/wejagejorogowi.pdf In PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/visev.pdfIn PDF document text
    • http://yejida.com/userfiles/file/midafumodovujoxiwo.pdfIn PDF document text
    • http://heimundsicherheit.de/userfiles/file/bomuw.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421d4273254---zufidubama.pdfIn PDF document text
    • http://hexindechem.com/upload/files/jibal.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/guxenegigakupig.pdfIn PDF document text
    • http://clickvay.com/upload/files/97861749312.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210915200858.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210916085913108.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/getowusagisi.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/44474076864.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/lumexuwitazifinex.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/vodebugezidivaxu.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/duwejagepisevitojax.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/28960615693.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/59983553955.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/72414562021.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/ruwepomomivavixefimobup.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210906122438_736211633.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/fuzodatepi.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/debibixaperodoxiz.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/bopube.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/xinunem.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/97166270729.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=rupaul+all+stars+5+episode+1PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94D 18596 bytes
SHA-256: 30f6b212f03bec2aebb3be1a35268d434d33fe82ba78012b8e5a4bac7e6970ef
font_02_sfnt_off0001292e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292E 10612 bytes
SHA-256: 9c6ff0ffad8b6e892c66d2cae9f97dd6c47e828404e0c412382bb55fb3e78a60

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